Question

The optimum level of fluoride in drinking water is between:

• A. 0.5-0.8 mg/L
• B. 0.2-0.4 mg/L
• C. 0.3-0.7mg/L
• D. 0.6-0.9mg/L

Answer 1

Answer:

A. 0.5-0.8 mg/L